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[1"9] ADDITIONAL
INFORMATION
There are currently various types of multiIchannel
signals (signals or formats with more than two channels).
• Types of multi-channel
signals
Dolby Digital, Dolby Pro Logic, DTS, high definition 3-1 signals (Japan MUSE Hi-Vision audio), DVD-Audio, SACD (Super Audio CD), MPEG multi-
channel audio, etc.
"Source"
here does not refer to the type of signal (format) but the recorded content. Sources can be divided into two major categories.
• Types of sources
• Movie audio
Signals created to be played in movie theaters. In general sound is recorded to be played in movie theaters
equipped with multiple surround speakers, regardless of the format (Dolby Digital, DTS, etc.).
Movie theater sound field
Dr_D
D
--
F-
s 4
=n
IDDD
DDDI
I
Multiple
surround speakers
{For 6.l-channel
system)
Listening
room sound field
Fqr_D
[]
- _\
t _ -.
SLll
liSR
I
D
III
O
D
I
I
I
r-I
r-I
]
In this case it is important
to achieve
the same sense of
expansion as in a movie theater with the surround channels.
To do so, in some cases the number of surround speakers is
increased (to four or eight) or speakers with bipolar or dipolar
properties are used.
SL: Surround L channel
SR: Surround R channel
SB: Surround back channel (1 spkr or 2 spkrs)
• Other types of audio
These signals are designed to recreate a 360 ° sound field using three to five speakers.
In this case the speakers should surround
the listener from all sides to create a uniform sound
field from 360 °. Ideally the surround speakers should function
as "point"
sound sources
in the
same way as the front speakers.
SL
SR
These two types of sources thus have different
properties,
and different
speaker settings, particularly for the surround speakers, are required
in order to achieve the ideal sound.
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